Optically stimulated luminescence dating of young sediments a review bria myles dating laz
Optically stimulated luminescence (OSL) dating of perennially frozen loess was tested on quartz grains extracted from deposits associated with the late Pleistocene Dawson tephra in western Yukon Territory, Canada.
OSL samples were obtained from ice-rich loess bracketing the Dawson tephra, while radiocarbon (C) samples were collected from the bulk sediments directly underlying the tephra and from a ground-squirrel burrow 2.7 m below the tephra.
The decline of agricultural land use from about 1915 onwards decreased sediment supply, while the increase of urbanisation from about 1950 amplified the flow energy of flooding by pluvial waters and overflows from storm basins, causing the presently ongoing incision in the area that began about AD 1975.
Des datations par OSL (Optically Stimulated Luminescence) sont utilisées pour reconstituer la chronologie de phases d’aggradation et d’incision dans un sous-bassin élémentaire du bassin de l’Yzeron (France).
Our results suggest that this method will provide a valuable tool in the reconstruction of past sea levels in Antarctica and other coarse-grained beach deposits across the globe.
Optically stimulated luminescence (OSL) dating is used to determine the (robust) chronology of the phases of sediment deposition and incision in a headwater sub-basin of the Yzeron Basin, France.
From this data a complex deposition and incision history is constructed for the last 500 years.
It is concluded that sediment deposition was mainly forced by sediment supply from ploughing areas.
Most current methods of reconstructing past sea levels within Antarctica rely on radiocarbon dating.
Deux brèves phases d’incision durant la première moitié du XIX siècle semblent liées à une baisse de la fourniture sédimentaire due à une diminution de la fréquence de précipitations intenses.
L’incision de cette période fut par la suite partiellement comblée par des sédiments.
The major controlling factors behind whether a system is erosional or depositional are (i) the density and nature of vegetation cover (e.g., grassland versus forest), (ii) the amount and in particular the intensity of precipitation (i.e.
the occurrence of extreme events such as heavy thunderstorms), and (iii) whether humans are using land for either agriculture (i.e.